Discount calculation in Proposal and Decimal limit to two

In a Proposal or Invoice template, I don’t want to calculate the Discount on lines just want to have the discount percent just like VAT / Tax written on line. I want to calculate the discount at the end.

Need to print the calculations on odt template as following picture.

Secondly, How can I reduce/limit the Discount percent decimal to 2 points for print only?
For example, my discount is 23.3333% but want to print 23.33% on odt template.

@eldy Hi Sir,
Can you help me out on this one please.